Furnace-grate.



No. 882,794. PATENTED MAR; 24, 1908.

J. J. YOBRIEN. FURNACE GRATE.

APPLICATION FILED OCT.15. 1906.

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FURNACE GRATB.

APPLICATION FILED 00115, 1908.

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direction in the fire chamber.

JOHN J. OBRIEN, OF ST. LOUIS, MISSOURI.

FURNACE-GRATE Specification of Letters Patent.

Patented March 24, 1908.

Application filed. October 15, 1906. Serial No. 338,999.

To all whom it may concern:

Be it known that I, JOHN J. OBRIEN, a citizen of the United States of America, residing at the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Furnace-Grates, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to a furnace grate having movable members therein alternately advanced and retracted or vice versa whereby the fuel may be,fed inwardly in sections or parts intermittently within a fire chamber onto succeeding grate bars.

Figure I is a longitudinal section taken through the forward end of a furnace and also through my grate mounted therein on the line II of Fig. II. Fig. II is a front elevation of a furnace and the forward portion of the pusher bar actuating mechanism. Fig. III is an enlarged detail longitudinal section taken through the forward end of the grate on the line IIIIII of Fig. II. Fig. IV is a similar view taken on the line IVIV of Fig. II. Fig. Vis a similar view taken on the line V-V of Fig. II.

A designates a furnace that may be of any ordinary constuction, but which as herein shown is a boiler furnace.

1 designates bearing bars that are each formed with a stepped series. of L-shaped ribs 1 slightly inclined forwardly, mounted in the fire chamber of a furnace and set in rearwardly inclined positions.

2 are grate bars supported by the ribs on the bearing bars and set in approximately horizontal positions, these grate bars being arranged in stepped order with the foremost grate bar at the highest level and the innermost grate bar at the lowest level.

8 are pusher bars that are slidably posi tioned above the grate bars 2 and which are adapted to push the fuel inwardly on said grate bars and from each grate bar to the neXt succeeding grate bar and in an inward These pusher bars 3 are of angular shape in cross section and formed with end guide webs 3 adapted to slide against the bearing bars. Each pusher bar is provided with forwardly eX tending arms 4, preferably located centrally of and also adjacent to the ends of the bar.

5 designates rocker rods non-circular in transverse section and having trunnionsl loosely mounted in the bearing bars 1 and corresponding in number to the number of pusher bars 3.

6 are double-armed levers non-rotatably mounted upon the rocker rods 5 and the upper arms of which are inclined forwardly to the aXis of the rocker rods and pivotally gonnected to the arms carried by the pusher are.

7 and 8 are respectively upper and lower throw bars that are pivotally connected to the lower arms of the levers 6, each alternating lever 6 being connected at 7 to the throw bar 7 and the intervening levers, or those alternating with the ones connected to the throw lever 7 being connected at 8 to the throw bar 8. By the described connection of the levers to the two throw bars, I provide for an alternating movement of the succeeding pusher bars to which the levers 6 are fitted.

9 designates a rock shaft that is j ournaled in the bearing bars 1 and to which is fixed a double-armed lever 10 pivotally connected to the throw bars 7 and 8 and through the medium of which said throw bars are reeiprocated when the rock shaft is rotated, first in one direction and then in the other direction.

1.1 is an operating handle or lever that is fitted to the rock shaft 9 and by which the desired movement is imparted thereto.

12 is a hopper located above the outer end of the grate and into which the fuel is placed to be fed inwardly on the grate bars to the fire chamber.

In the practical use of my grate the fuel is introduced into the hopper 12 and the lever 11 is rocked backward and forward with the result of imparting movement to the rock shaft 9, the throw bars, the levers 6 and the pusher bars 3. During the movement of these parts each alternating pusher bar moves in a forward direction and the intervening pusher bar moves in a rearward direction, as a consequence of which the fuel is first carried inwardly by one set of the pusher bars and then by the other set of the pusher bars, which latter have receded during the inward movement of the first. By this arrangement the fuel is gradually car ried into the fire chamber whenever the, movable parts of the grate are operated for fuel feeding action. The pusher bars are preferably made of angular shape in cross section, in order that they will contain a forward vertically disposed member to press against the fuel and an outwardly extending horizontal ledge that operates beneath the grate bars above it and serves to prevent the passage of fuel into a position between the grate bars and the pusher bars to interfere with the movement of said pusher bars.

I claim:

1. A furnace grate, comprising bearing bars each formed with a stepped series of ribs, grate-bars mounted upon said ribs, pusher bars of right angle shape in cross section, adapted to slide between the gratebars, and each having a forwardly extending arm within its angle, a series of IOCIZGI rods each having trunnions loosely mounted 1n the bearing bars, double armed levers fixed to the rocker rods having their upper arms pivotally connected to the arms of the pusher bars, an upper throw bar to whlch alternate lower arms of the double armed levers are pivotally connected and on which the upper throw bar is supported, a lower throw bar to which the lower arms of the double armed levers, alternating with the first named lower arms are pivotally connected and from which the lower throw bar is suspended, and an actuating device consisting of a rock shaft journaled in the bearing bars, and a double armed lever fixed to the rock shaft and having its upper arm pivotally connected to the upper throw bar and its lower arm pivotally connected to the lower throw bar whereby the alternate pusher bars are made to move simultaneously in opposite directions.

2. A furnace grate comprising bearing bars each formed with a stepped series of L- shaped ribs forwardly inclined, grate bars mounted upon said L-shaped ribs, pusher bars of right angle shape in cross section, adapted to slide between the grate-bars, and each having a forwardly extending arm within its angle, a series of rocker rods each having trunnions loosely mounted in the bearing bars, double armed levers fixed to the rocker rods having their upper arms pivotally connected to the arms of the pusher bars, an upper throw bar to which alternate lower arms of the double armed levers are pivotally connected and on which the upper throw bar is supported, a lower throw bar to which the lower arms of the double armed levers, alternating with the first named lower arms are pivotally connected and. from which the lower throw bar is suspended, and an actuating device consisting of a rock shaft journaled in the bearingbars, and a double armed lever fixed to the rock shaft and having its upper arm pivotally connected to the upper throw bar and itslower arm pivotally connected to the lower throw bar whereby the alternate pusher bars are made to move simultaneously in opposite directions.

3. A furnace grate comprising bearing bars; each formed with a stepped series of' ribs, grate bars mounted upon said ribs, pusher bars of right angle shape in cross section, adapted to slide between the grate bars,

and each having a plurality of forwardly extending arms within its angle, a series of rocker rods each having trunnions loosely mounted in the bearing bars, inner arms fixed to the rocker bars and pivotally connected. to the inner forwardly extending arms of the pusher bars, double armed levers fixed to the rocker rods having their upper arms pivotally connected to the outer arms of the pusher bars, an upper throw bar to which alternate lower arms of the double armed levers are pivotally connected and on which the upper throw bar is suspended, a lower throw bar to which the lower arms of the double armed lever, alternating with the first named lower arms are pivotally connected and from which the lower throw bar is suspended, and an actuating device consisting of a rock shaft ournaled in the bearing bars, and a double armed lever fixed to the rock shaft and having its upper arm pivotally connected to the upper throw bar and its lower arm pivotally connected to the lower throw bar whereby the alternate pusher bars are made to move simultaneously in opposite directions.

4. A furnace grate, comprising bearing bars each formed with a stepped series of ribs, grate-bars mounted upon said ribs, pusher bars of right-angle shape in cross section, adapted to slide between the gratebars, and each having a forwardly extending arm within its angle, and end guide webs adapted to slide against the bearing bars, a series of rocker rods each having trunnions loosely mounted in the bearing bars, double armed levers fixed to therocker rods having their upper arms pivotally connected to the arms of the usher bars, an upper throw bar to which a ternate lower arms of the double armed levers are pivotally connected and on which the upper throw bar is suported, a lower throw bar to which the ower arms of the double armed levers, alternating with the first named lower arms are pivotally connected and from which the lower throw bar is suspended, and an actu; ating device consisting of a rock shaft our? naled in the bearing bars, and a double armed lever fixed to the rock shaft and hav-. ing its upper arm pivotally connected to the upper throw bar and its lower arm pivot a y connected to the lower throw bar where by the alternate pusher bars are made to move simultaneously in opposite directions.

5. A furnace grate, comprising bearing bars each formed with a stepped series of ribs, grate-bars mounted upon said ribs, pusher bars of right-angle shape in cross section, adapted to slide between the grates bars, and each having a forwardly extending arm Within its angle, a series of rocker rods each having trunnions loosely mounted in the bearing bars, double armed levers fixed to the rocker rods having their upper arms inclined forwardly to the axis of the rocker rods and pivotally connected to the arms of the pusher bars, an upper throw bar to which alternate lower arms of the double armed levers are pivotally connected and on which the upper throw bar is supported, a lower throw bar to which the lower arms of the double armed levers, alternating with the first named lower arms are pivotally connected and from which the lower throw bar is suspended, and an actuating device consisting of a rock shaft ournaled in the hearing bars, and a double armed lever fixed to the rock shaft and having its upper arm pivotally connected to the upper throw bar and its lower arm pivotally connected to the lower throw bar whereby the alternate pusher bars are made to move simultaneously in opposite directions.

, 6. A furnace grate comprising bearing bars, each formed with a stepped series of L-shaped ribs, grate bars mounted upon said ribs, pusher bars of right-angle shape in cross section, adapted to slide between the grate bars, and each having a plurality of forwardly extending arms within its angle, a series of rocker rods each having trunnions loosely mounted in the bearing bars, mner arms inclined forwardly to the axis of the rocker rods, fixed to the rocker bars and pivotally connected to the inner forwardly extending arms of the pusher bars, double armed levers fixed to the rocker rods having their upper arms inclined forwardly to the axis of the rocker rods and pivotally connected to the outer arms of the pusher bars, an upper throw bar to which alternate lower arms of the double armed. levers are pivotally connected and on which the upper throw bar is suspended, a lower throw bar to which the lower arms of the double armed lever, alternating with the first named lower arms are pivotally connected and from which the lower throw bar is suspended, and an actuating device consisting of a rock shaft journaled in the bearing bars, and a double armed lever fixed to the rock shaft and having its upper arm pivotally connected to the upper throw bar and its lower arm pivotally connected to the lower throw bar whereby the alternate pusher bars are made to mo simultaneously in opposite directions.

JOHN J. OBRIEN. In presence of- NELLIE V. ALEXANDER, BLANOHE HOGAN. 

